misc/libphysfs/lzma/C/Compress/Lz/LzHash.h
changeset 13904 99b265e0d1d0
parent 13903 5f819b90d479
child 13905 b172a5d40eee
equal deleted inserted replaced
13903:5f819b90d479 13904:99b265e0d1d0
     1 /* LzHash.h */
       
     2 
       
     3 #ifndef __C_LZHASH_H
       
     4 #define __C_LZHASH_H
       
     5 
       
     6 #define kHash2Size (1 << 10)
       
     7 #define kHash3Size (1 << 16)
       
     8 #define kHash4Size (1 << 20)
       
     9 
       
    10 #define kFix3HashSize (kHash2Size)
       
    11 #define kFix4HashSize (kHash2Size + kHash3Size)
       
    12 #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
       
    13 
       
    14 #define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
       
    15 
       
    16 #define HASH3_CALC { \
       
    17   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \
       
    18   hash2Value = temp & (kHash2Size - 1); \
       
    19   hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
       
    20 
       
    21 #define HASH4_CALC { \
       
    22   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \
       
    23   hash2Value = temp & (kHash2Size - 1); \
       
    24   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
       
    25   hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & p->hashMask; }
       
    26 
       
    27 #define HASH5_CALC { \
       
    28   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \
       
    29   hash2Value = temp & (kHash2Size - 1); \
       
    30   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
       
    31   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)); \
       
    32   hashValue = (hash4Value ^ (g_CrcTable[cur[4]] << 3)) & p->hashMask; \
       
    33   hash4Value &= (kHash4Size - 1); }
       
    34 
       
    35 /* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ g_CrcTable[cur[2]]) & 0xFFFF; */
       
    36 #define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ g_CrcTable[cur[1]]) & 0xFFFF;
       
    37 
       
    38 
       
    39 #define MT_HASH2_CALC \
       
    40   hash2Value = (g_CrcTable[cur[0]] ^ cur[1]) & (kHash2Size - 1);
       
    41 
       
    42 #define MT_HASH3_CALC { \
       
    43   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \
       
    44   hash2Value = temp & (kHash2Size - 1); \
       
    45   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
       
    46 
       
    47 #define MT_HASH4_CALC { \
       
    48   UInt32 temp = g_CrcTable[cur[0]] ^ cur[1]; \
       
    49   hash2Value = temp & (kHash2Size - 1); \
       
    50   hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
       
    51   hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (g_CrcTable[cur[3]] << 5)) & (kHash4Size - 1); }
       
    52 
       
    53 #endif